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Your problem is that, in order for it to be a legal copy of Protel99SE, it must not have been used to upgrade to DXP or Altium Designer. Once a user upgrades, the old license is considered transferred to the newer version, and the older software is no longer legally licensed.
Your best bet would be to advertise on the only active Protel forum still in use. Sign up here: **broken link removed** , and then post your request. There are still active members who may have, or know of, a legal copy of the older software.